Everything Script

import RPi.GPIO as GPIO
import time
import I2C_LCD_driver

GPIO.setmode(GPIO.BCM)
mylcd = I2C_LCD_driver.lcd()
counterPin = 18
startBtn = 15
exitBtn = 14
startThread = 20
doneThread = 26
exitThread = 16
GPIO.setup(doneThread, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(startBtn, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(exitBtn, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(counterPin, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(startThread, GPIO.OUT)
GPIO.setup(exitThread, GPIO.OUT)
coins = 0
creditss = 0
ready = False
test = True
ingame = False

mylcd.lcd_display_string("Insert $1.00", 1, 4)
mylcd.lcd_display_string("for 1 credit", 2, 4)
mylcd.lcd_display_string("and press start when", 3, 0)
mylcd.lcd_display_string("you're ready!", 4, 3)

def started():
    GPIO.output(startThread, 1)
    time.sleep(0.2)
    GPIO.output(startThread, 0)

def exited():
    GPIO.output(exitThread, 1)
    GPIO.output(startThread, 1)
    time.sleep(0.2)
    GPIO.output(exitThread, 0)
    GPIO.output(startThread, 0)

while True:
    start = GPIO.input(startBtn)
    input_state = GPIO.input(counterPin)
    exit = GPIO.input(exitBtn)
    if ingame == False:
        if input_state == False:
            mylcd.lcd_clear()
            coins += 1
            time.sleep(0.09)
            mylcd.lcd_display_string(str(coins) + " cents inserted", 2, 1)
        if coins == 100:
            coins -= 100
            creditss += 1
            mylcd.lcd_display_string("You have " + str(creditss) + " credits", 3, 1)
        if creditss >= 1:
            ready = True
    if ingame == True:
        if start == False:
            started()
    if exit == False:
        mylcd.lcd_display_string(str(coins) + " cents inserted", 2, 1)
        if ingame == True:
            exited()
            ingame = False
    while ready == True:
        start = GPIO.input(startBtn)
        input_state = GPIO.input(counterPin)
        done = GPIO.input(doneThread)
        if input_state == False:
            mylcd.lcd_clear()
            coins += 25
            time.sleep(0.09)
            mylcd.lcd_display_string(str(coins) + " cents inserted", 2, 1)
        if coins == 100:
            coins -= 100
            creditss += 1
            mylcd.lcd_display_string("You have " + str(creditss) + " credits", 3, 1)
        if start == False:
            if creditss > 0:
                started()
                creditss -= 1
                ready = False
                ingame = True
                mylcd.lcd_clear()
                mylcd.lcd_display_string("Have Fun!", 2, 6)
                mylcd.lcd_display_string("You have " + str(creditss) + " credits", 3, 1)
                break